JP2008169740A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit discharge of lubricating oil into refrigeration cycle by preventing lubricating oil stored in an oil storage chamber from billowing and foaming due to flow of gas discharged into a high pressure chamber to inhibit reduction of oil storage quantity for improving noise, durability and system performance of a compressor. <P>SOLUTION: The high pressure chamber 14 and the oil storage chamber 15 defined by a rear part side plate 7 and a bulkhead 16 are provided in a high pressure case 13. An oil pocket 18 is formed by indenting a part of the bulkhead 16 and a communication passage 19 discharging lubricating oil separated from air current to the oil storage chamber 15 is provided in the oil pocket 18. A straightening vane 26b is provided on an upper part of the oil pocket part 18 to prevent main flow of air current from flowing into the oil pocket 18. The communication passage 19 has passage area to discharge lubricating oil separated from the air current to the oil storage chamber 15 without staying in the oil pocket 18. Lubricating oil is thereby prevented from billowing and foaming to inhibit reduction of oil storage quantity, and discharge of lubricating oil into the refrigeration cycle is inhibited even if a large quantity of refrigerant is discharged in start. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor used in an automobile air conditioner or the like.

  Conventionally, a high-pressure chamber of this type of compressor has been provided with a mechanism for separating lubricating oil from a compressed gas fluid (hereinafter referred to as a refrigerant) and an oil storage section for storing the separated lubricating oil. The back pressure applying device is used to push the vane out of the rotor by supplying the lubricating oil stored in the oil storage unit to the vane back pressure unit and to lubricate the cylinder, vane, rotor and the like.

In such a compressor, the oil level of the oil storage part is suppressed, and the lubricating oil stored in the oil storage part must be kept at a level higher than the lubricating oil supply port at the lower part of the vane back pressure applying device, For this purpose, a substantially horizontal stabilizer that can move in the vertical direction is provided in the high-pressure chamber, and there is a structure in which this stabilizer moves with the surface of the lubricating oil stored in the oil reservoir of the high-pressure chamber (for example, Patent Documents). 1).
JP 2006-118365 A

  However, in the conventional configuration, as shown in FIGS. 7 and 8, the clearance between the entire periphery of the stabilizer 101 and the wall of the high-pressure case 102 and the vane back pressure applying device 103 is several mm in consideration of variations in parts and assembly. It is necessary to secure.

  When the refrigerant discharge is stabilized for a while after the compressor is started, the refrigerant discharge amount is reduced, the refrigerant flow flowing from the gap around the stabilizing plate 101 is also stabilized, and the oil level can be suppressed. The oil level is also maintained higher than the lubricating oil supply port 107. By supplying the lubricating oil stored in the oil storage section 104 to the vane back pressure section, the pressure of the vane back pressure section is properly stabilized, so there is no vane jump phenomenon. There is no vibration or noise caused by the cylinder collision.

  On the other hand, a large amount of refrigerant is discharged for a few seconds after the start of pressure equalization or the intermittent start of the thermostat, so the downward flow becomes stronger. As shown by the arrows in FIG. Most of the lubricating oil that flows into the oil storage unit 104 and is stored by the jet is taken up by the flow of the discharged refrigerant, is wound up to the high-pressure chamber 105, and is discharged from the compressed gas discharge port 106 into the refrigeration cycle. For this reason, the amount of lubricating oil in the oil storage section 104 decreases, and the oil level may fall from the lubricating oil supply port 107 to which only the lubricating oil should be supplied, and the gas component of the refrigerant may be supplied to the vane back pressure section.

  Further, even when the oil level of the oil storage section 104 is higher than the lubricating oil supply port 107, the discharged refrigerant flows into the lubricating oil, so that the lubricating oil around the lubricating oil supply port 107 becomes foamed and the refrigerant is supplied from the lubricating oil supply port 107. A part is mixed as a gas component.

  Due to the supply or mixing of this gas component, the pressure of the lubricating oil supplied to the vane back pressure part is insufficient for a few seconds from the start to the stable state, causing the vane jump phenomenon, and the collision between the vane and the cylinder. This causes the problem that the vibration and noise of the compressor are generated, and the problem that the wear of the vane tip is increased due to poor lubrication and the durability is lowered.

  The present invention solves the above-mentioned conventional problems, and prevents the oil surface of the lubricating oil stored in the oil storage chamber of the high-pressure case from rising and bubbling even during start-up such as pressure equalization start-up and thermo-interruption. Low noise is achieved by suppressing a decrease in the amount of oil stored in the oil storage section by suppressing that a part of the lubricating oil stored in the oil is wound up in the refrigerant flow and discharged from the compressed gas discharge port into the refrigeration cycle. An object is to provide a high performance, high durability compressor.

  In order to solve the above-described conventional problems, the compressor of the present invention includes a high-pressure chamber and an oil storage chamber defined by a rear side plate and a partition in a high-pressure case from which refrigerant is discharged, and a part of the partition is recessed. The oil reservoir is provided with a communication passage through which the lubricating oil separated from the refrigerant is discharged into the oil storage chamber.

  As a result, a large amount of refrigerant is discharged and the downward flow is strengthened, such as for a few seconds after the start of pressure equalization or the intermittent start of the thermostat, and the downward flow becomes stronger, and the discharged refrigerant flows into the oil storage chamber through the communication portion, and dynamic pressure is applied. Even if there is only one communication path, the lubricating oil accumulated in the oil storage chamber becomes a one-way flow and is difficult to leak into the high-pressure chamber, so the oil level in the oil storage chamber can be maintained higher than the lubricating oil supply port, and the vane It is possible to prevent the refrigerant gas from flowing into the back pressure part.

  Further, the compressor of the present invention is provided with a baffle plate in the upper part of the oil reservoir so that the main flow of the refrigerant does not flow into the oil reservoir.

  As a result, even when a large amount of refrigerant is discharged into the high-pressure chamber at startup, the refrigerant flow is rectified upward by the rectifying plate provided at the top of the oil reservoir, and the main flow does not flow into the oil reservoir and dynamic pressure is applied. This makes it difficult to prevent the oil surface of the lubricating oil accumulated in the oil storage chamber from undulating and bubbling, so that the gas components mixed in the lubricating oil supplied to the back of the vane can be reduced.

  The communication passage of the compressor of the present invention has a passage area through which the lubricating oil separated from the refrigerant is discharged to the oil storage chamber without collecting in the oil reservoir.

  As a result, the lubricating oil is quickly discharged from the communication passage to the oil storage chamber without accumulating in the oil reservoir, so that almost no discharge refrigerant rolls up the lubricating oil accumulated in the oil storage chamber, and freezing is performed from the compressed gas discharge port. Lubricating oil discharge during the cycle can be reduced.

  The compressor of the present invention suppresses the mixing of gas components in the lubricating oil supplied to the vane back pressure part, and can reduce the vibration and noise of the compressor without causing the vane jump phenomenon. The wear of the tip can be suppressed and the durability of the compressor can be improved.

  Furthermore, the discharge of lubricating oil from the compressed gas discharge port into the refrigeration cycle can be suppressed, and the system performance of the refrigeration cycle can be improved.

  In the compressor according to the first aspect of the present invention, a compression mechanism that compresses a gas-fluid containing lubricating oil, and a gas-fluid compressed by the compression mechanism is guided, and at least a part of the lubricant contained in the gas-fluid is separated and stored. In a compressor including a high pressure case having an oil storage part, the high pressure case is partitioned into a high pressure chamber and an oil storage chamber by a partition, and an oil reservoir part in which a part of the partition is recessed, and the oil reservoir part is separated from the gas fluid. A communication passage that discharges the lubricated oil to the oil storage chamber is provided, and a large amount of refrigerant is discharged and the downward flow becomes stronger, such as for several seconds after the start of pressure equalization or the intermittent start of the thermo, and the discharged refrigerant Even if the fluid flows into the oil storage chamber through the communicating portion and is subjected to dynamic pressure, there is only one communication passage, so that the lubricating oil accumulated in the oil storage chamber becomes difficult to leak into the high pressure chamber.

  Therefore, it is difficult for the lubricating oil in the oil storage chamber to be wound up by the refrigerant in the high-pressure chamber rotating at high speed, and the oil level in the oil storage chamber is maintained above the lubricating oil supply port, so that sufficient lubricating oil is supplied to the back of the vane. Since the pressure at the back of the vane is stabilized, the vane jump phenomenon is less likely to occur and the occurrence of compressor vibration and noise can be reduced.

  Furthermore, since the lubricating oil can be sufficiently supplied from the lubricating oil supply port into the compression mechanism through the back of the vane, wear at the tip of the vane can be suppressed and the durability of the compressor can be improved.

  In the second invention, a rectifying plate is provided at the upper part of the oil reservoir so that the main flow of the refrigerant does not flow into the oil reservoir, and even when a large amount of refrigerant is discharged into the high-pressure chamber at the time of start-up, The flow is rectified upward by the flow straightening plate provided at the upper portion of the oil reservoir, and the main flow does not flow into the oil reservoir, making it difficult to apply dynamic pressure.

  Therefore, it is possible to prevent the oil level of the lubricating oil accumulated in the oil storage chamber from undulating and bubbling, and since the gas component is hardly mixed in the lubricating oil supplied from the lubricating oil supply port, sufficient pressure on the back of the vane is secured. Thus, the vane jump phenomenon does not occur, and the occurrence of compressor vibration and noise can be further reduced.

  According to a third aspect of the present invention, the area of the communication path is a passage area where the lubricating oil separated from the refrigerant is discharged into the oil storage chamber without collecting in the oil reservoir, and the lubricating oil separated from the refrigerant is stored in the oil reservoir. Since it is discharged to the oil storage chamber without being accumulated in the oil storage chamber, the discharged refrigerant hardly wraps up the lubricating oil accumulated in the oil storage chamber, and the discharge of the lubricating oil from the compressed gas discharge port into the refrigeration cycle can be reduced.

  Therefore, the adverse effect of the lubricating oil on the refrigeration cycle is reduced, and the system performance can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 3 show a first embodiment of a compressor according to the present invention. As shown in the figure, in this compressor, a substantially cylindrical rotor 2 is rotatably accommodated in a cylinder 1 having a cylindrical inner wall so that a part of the outer periphery forms a minute gap with the inner wall of the cylinder 1. .

  A plurality of vane slots 3 are provided at equal intervals in the rotor 2, and vanes 4 are slidably inserted into the vane slots 3. The rotor 2 rotates when a drive shaft 5 formed integrally therewith is driven to rotate.

  The opening portions at both ends of the cylinder 1 are respectively closed by the front side plate 6 and the rear side plate 7, and the working chamber 8 is formed inside the cylinder 1. A suction port 9 and a discharge port 10 communicate with the working chamber 8, the discharge port 10 is connected to a high pressure passage 12, and a discharge valve 11 is disposed between the discharge port 10 and the high pressure passage 12. A high-pressure case 13 is attached to the rear side plate 7, the high-pressure chamber 14 and the oil storage chamber 15 in the high-pressure case 13 are partitioned by a partition wall 16, and the discharge refrigerant is a compressed gas discharge port provided at the top of the high-pressure chamber 14. 17 is discharged into the refrigeration cycle (not shown).

  The oil reservoir 18 having a recessed part of the partition wall 16 is provided with a communication passage 19 for discharging the lubricating oil separated from the refrigerant to the oil storage chamber 15. In this embodiment, the dimensions of the communication passage 19 are 0.5 cm wide, 0.5 cm deep, and a passage area of 0.25 square centimeters.

  Lubricating oil is sucked in from a lubricating oil supply port 20 provided in the lower part of the oil storage chamber 15, passes through an oil supply path 23 from a supply passage 21 via a vane back pressure applying device 22, and forward from an oil groove 24 provided in the rear side plate 7. It is supplied to the vane back pressure part 25 partitioned by the part side plate 6, the rear side plate 7 and the vane 4.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When power is transmitted from a driving source such as an engine and the drive shaft 5 and the rotor 2 rotate in the clockwise direction in FIG. 2, the suction refrigerant flows into the working chamber 8 from the suction port 9. The discharged refrigerant compressed with the rotation of the rotor 2 pushes up the discharge valve 11 from the discharge port 10 and is discharged into the high-pressure passage 12, flows into the high-pressure chamber 14 above the high-pressure case 13, and enters the refrigeration cycle from the compressed gas discharge port 17. It is discharged inside (not shown).

  On the other hand, a part of the lubricating oil contained in the discharged refrigerant collides with the wall of the high-pressure case 13 or the partition wall 16 and is separated from the discharged refrigerant and is collected on the partition wall 16 below the high-pressure chamber 14, and a part of the partition wall 16 is recessed. The oil reservoir 18 is discharged to the oil storage chamber 15 from a communication portion 19 formed on the bottom surface of the oil reservoir 18.

  Lubricating oil accumulated in the oil storage chamber 15 is sucked from a lubricating oil supply port 20 provided in the lower portion of the oil storage chamber 15, and is provided on the rear side plate 7 from the supply passage 21 through the oil supply passage 23 via the vane back pressure applying device 22. Then, the oil is supplied from the oil groove 24 to the vane back pressure portion 25 partitioned by the front side plate 6, the rear side plate 7 and the vane 4. The vane back pressure applying device 22 controls the oil supply pressure and the amount of oil supplied to the compression mechanism according to the gas refrigerant pressure around the compression mechanism.

  The lubricating oil supplied to the vane back pressure part 25 functions to push the vane 4 to the outside of the rotor 2 by the pressure. Lubricating oil is supplied to the rotor 2, the vane 4, the inner wall of the cylinder 1 and the like constituting the compression mechanism via the vane back pressure portion 25 and lubricates each portion.

  A large amount of refrigerant is discharged and the downward flow becomes stronger, such as for a few seconds after the start of pressure equalization or the intermittent start of thermo, and the discharged refrigerant flows into the oil storage chamber 15 through the communication path 19 to apply dynamic pressure. However, unlike the prior art, the high-pressure chamber 14 and the oil storage chamber 15 are partitioned by the partition wall 16, so that there is no gap and there is only one communication passage 19, so that the lubricating oil is stored in the oil storage chamber 15 as a one-way flow. Is less likely to leak into the high-pressure chamber 14, so that the oil level in the oil storage chamber 15 can be maintained higher than the lubricating oil supply port 20, and refrigerant gas can be prevented from flowing into the vane back pressure portion. Therefore, the lubricating oil is supplied to the vane back pressure unit 25, the vane back pressure is stabilized, and the occurrence of vibration and noise of the compressor can be reduced.

  Further, since the lubricating oil can always be supplied from the lubricating oil supply port 20 to the compression mechanism through the vane back pressure portion 25, wear of the tip of the vane 4 can be suppressed and the durability of the compressor can be improved.

(Embodiment 2)
Next, another embodiment of the compressor of the present invention will be described with reference to FIG. In addition, about the component substantially the same as the said embodiment, the same referential mark is attached | subjected and description is abbreviate | omitted and only a different point is demonstrated.

  A rectifying plate 26b is provided above the oil reservoir 18 so that the main flow of gas fluid does not flow into the oil reservoir 18, and a large amount of refrigerant discharged into the high-pressure chamber 14 at the time of startup is unidirectionally generated by the rectifying plate 26a. The flow is rectified to flow in the direction (X direction in the figure), the discharged refrigerant is rectified in a substantially horizontal direction by the partition wall 16, and is further rectified and swung upward by the rectifying plate 26b provided at the upper part of the oil reservoir 18, and discharged. The refrigerant is discharged from the compressed gas discharge port 17 during the refrigeration cycle.

Lubricating oil separated by colliding with the wall of the high-pressure case 13 and the partition wall 16 is heavier than the refrigerant gas and has a higher viscosity. Therefore, the lubricating oil is pushed by the coolant flow along the partition wall 16 and flows into the oil reservoir 18. It is discharged into the chamber 15. As described above, the refrigerant discharged in the vicinity of the partition wall 16 flows upward from substantially horizontal by the rectifying plate 26b, so that the main flow does not flow into the oil reservoir 18 and it is difficult to apply dynamic pressure to the oil storage chamber 15. Therefore, it is possible to prevent the oil surface of the lubricating oil accumulated in the oil storage chamber 15 from undulating and foaming, and it is difficult for refrigerant gas to be mixed into the lubricating oil, and the lubricating oil supplied from the lubricating oil supply port 20 Since almost no gas component is mixed in, the back pressure of the vane back pressure portion 25 is sufficiently ensured, and the occurrence of compressor vibration and noise can be further reduced.

(Embodiment 3)
Next, another embodiment of the compressor of the present invention will be described with reference to FIGS. In addition, about the component substantially the same as the said embodiment, the same referential mark is attached | subjected and description is abbreviate | omitted and only a different point is demonstrated.

  The area of the communication passage 19 of the present invention is the passage area through which the lubricating oil separated from the refrigerant is discharged into the oil storage chamber 15 without collecting in the oil reservoir 18.

  In the present embodiment, the dimension and the area of the communication path 19 are preferably set to an appropriate size according to the viscosity of the lubricating oil used. Specifically, the communication path 19 has a width of 1 cm, a depth of 3 cm, and 3 square centimeters. It is the passage area.

  By doing so, the amount of lubricating oil discharged into the oil storage chamber 15 is larger than the amount of lubricating oil separated from the refrigerant discharged during operation, and the oil does not accumulate in the oil reservoir 18, and the dynamic pressure also flows into the oil storage chamber 15. Therefore, the refrigerant flow hardly lifts the lubricating oil, and the lubricating oil contained in the refrigerant gas discharged from the compressed gas discharge port 17 of the high-pressure chamber 14 to the refrigeration cycle can be reduced.

  Therefore, the heat transfer of the heat exchanger (not shown) of the refrigeration cycle is improved and the pressure loss of the piping (not shown) is reduced, so that the system performance can be improved.

  In the present embodiment, the communication path 19 is provided in the partition wall 16 of the high-pressure case 13, but it may be provided in the rear side plate 7, and the same operations and effects as in this embodiment are achieved.

  As described above, the compressor of the present invention suppresses the mixing of the refrigerant gas component into the lubricating oil supplied to the vane back pressure part even during startup such as pressure equalization startup or thermo-interruption. Since the pressure of the pressure part is sufficiently secured and stabilized, the vibration and noise of the compressor can be reduced.

  In addition, since it is possible to improve the system performance of the refrigeration cycle by reducing the discharge of lubricating oil from the compressed gas discharge port into the refrigeration cycle, the invention can be applied to a compressor having other types of compression mechanisms.

Sectional drawing of the compressor in Embodiment 1 of this invention BB sectional view of FIG. CC arrow view of the high pressure case of FIG. CC arrow figure of the high voltage | pressure case in Embodiment 2 of this invention Sectional drawing of the compressor in Embodiment 3 of this invention CC arrow view of the high pressure case of FIG. Sectional view of the high-pressure case in the conventional example AA sectional view shown in FIG.

Explanation of symbols

7 Rear side plate 13 High pressure case 14 High pressure chamber 15 Oil storage chamber 16 Bulkhead 17 Compressed gas discharge port 18 Oil reservoir portion 19 Communication passage 20 Lubricating oil supply port 25 Vane back pressure portion 26a Current plate 26b Current plate

Claims (3)

A high-pressure case having a compression mechanism for compressing a gas-fluid containing lubricating oil, and an oil storage part in which the gas-fluid compressed by the compression mechanism is guided and at least a part of the lubricating oil contained in the gas-fluid is separated and stored In the compressor, the high-pressure case is partitioned into a high-pressure chamber and an oil storage chamber by a partition, and an oil reservoir portion in which a part of the partition wall is recessed, and lubricating oil separated from the gas fluid is stored in the oil reservoir portion. A compressor characterized in that a communication passage for discharging to the chamber is provided. The compressor according to claim 1, wherein a baffle plate is provided at an upper portion of the oil reservoir so that a main flow of gas fluid does not flow into the oil reservoir. 3. The compressor according to claim 1, wherein the communication passage has a passage area through which lubricating oil separated from the gas fluid is discharged to the oil storage chamber without collecting in the oil reservoir. 4.

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